From the introduction: Welcome to the tunnels under Kerthaz. The baron is offering a tenth of what is found as a reward to explorers willing to map it. Publisher's blurb: King Thadar’s Catacombs adventure takes our players to castle Kerthaz, where builders discovered a network of tunnels. The Baron of Kerthaz, Lord Gabriel, is offering a tenth of what is found in the underground, as a reward to explorers willing to map it. It seems Lord Gabriel is unwilling to send anymore of his people down into the tunnels after two groups did not return.